ZST
application/zstd
Magic Bytes
Offset: 0
28 B5 2F FD
Zstandard (ZST) is an open-source lossless data compression algorithm and file format developed by Meta for efficient real-time data compression. It is widely utilized for system backups, database archives, and as the default compression method for several major Linux distribution package managers. While the format itself is safe, implementations must account for potential memory exhaustion when decompressing untrusted archives that feature significant compression ratios or large dictionary sizes.
Validation Code
How to validate .zst files in Python
Python
def is_zst(file_path: str) -> bool:
"""Check if file is a valid ZST by magic bytes."""
signature = bytes([0x28, 0xB5, 0x2F, 0xFD])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .zst files in Node.js
Node.js
function isZST(buffer: Buffer): boolean {
const signature = Buffer.from([0x28, 0xB5, 0x2F, 0xFD]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsZST(data []byte) bool {
signature := []byte{0x28, 0xB5, 0x2F, 0xFD}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/zst
curl https://filesignature.org/api/v1/zst